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OpenStudy (anonymous):
jack mows his lawn in 4 hours. Marilyn mows her lawn in 5 hours. how long would it take them to do it together?
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OpenStudy (anonymous):
1/5+1/4=1/x 4x+5x=20 x=20/9
hero (hero):
\[\frac{4 \times 5}{4+5}\]
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